CHAPTER II. 
THE VEGETATIVE ORGANS (continued). 
THE leaves of all our grasses consist of the blade, 
which passes directly into the sheath, without any petiole 
or leaf-stalk (Fig. 1). 
The sheath is usually obviously split, and so rolled 
round the internode that one edge overlaps the other, 
but in the following grasses the sheath is either quite 
entire, or only slit a short way down, the two edges being 
fused as it were for the greater part of its length. 
Sheath more or less entire. 
Glyceria aquatica and G. fluitans. 
Melica uniflora and M. nutans. 
Dactylis glomerata. 
Poa trivialis (Fig. 8), P. pratensis, P. alpina. 
Sesleria cerulea. 
Bromus (all the species). 
Briza media and B. minor. 
In some cases—e.g. Arrhenatherum, Bromus asper, and 
Holcus lanatus—the sheath is marked with a more or less 
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